<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
</head>
<body>
  <div id="app">
    <ul>
      <li v-for="(item,index) in arr" :key="index">{{item}}</li>
    </ul>
    <button @click="change()">走一走</button>
  </div>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        arr: ["帅哥", "美女", "程序猿"]
      },
      methods: {
        change(){
          //将第一个里添加到最后
          this.arr.push(this.arr[0])
          //删除现在的第一个li
          this.arr.shift() 
        }
      },
    })
  </script>
</body>
</html>